Make every detail perfect and limit the number of details to perfect.

The line expresses a minimalist philosophy of design and execution: quality comes from obsessive care for small elements, but excellence is only sustainable when the scope is constrained. It implies a tradeoff between breadth and polish—adding more features, steps, or “details” increases complexity and dilutes attention, making true perfection less attainable. Read as advice for product building and leadership, it favors focus, simplicity, and disciplined prioritization: choose fewer things to do, then do them exceptionally well. The quote also hints at an iterative mindset—reduce to essentials, refine, and resist the temptation to expand until the core experience is coherent and elegant.